Rotary field-magnet.



E. VOLKBRS.

ROTARY FIELD MAGNET.

APPLICATION FILED APR. 2,1909.

Patented July 12, 1910 @me "(rm EMIL VOLKERS, OF BERLIN, GERMANY.

ROTARY FIELD-MAGNET.

Specification of Letters Patent.

Patented July 12, 1910.

Application filed April 2, 1909. Serial No. 487,520.

L To all whom it may concern:

' Fig. 3 is a side elevation.

distance pieces Be it known that I, EMIL VoLKnRs, engineer, a subject of the Emperor of Germany, residing at 10/11 Potsdamerstrasse, Berlin, WV, have invented a certain new and useful Rotary Field-Magnet, of which the following is a specification.

This invention relates to rotary permanent field magnets for multipol'ar machines having a stationary armature and also to a process for the production thereof.

A constructional form is illustrated in the accompanying drawings.

Figure 1 shows a section, transverse to the axis, of the entire arrangement of such a machine, in which the magnets are not in section. Fig. 2 is a plan of these magnets, and

Fig. 4: shows a plan view of a magnet system ready'for receiving the cast portion and Fig. 5 is a cross section corresponding to Fig. 4:-

The magnet m with the poles N, S, has nearly the form of a fiat spiral of about 13; winding. The magnets are arranged to form a magnet system A in such a manner that the pole ends lying at the circumference are parallel to the axis, whereas the center piece is inclined toward the axis. .The magnet system A is adapted to rotate within a stationary armature B of which the winding is indicated by e.

Fig. 1 shows a compound field magnet with twelve poles. Near the axis (2, in the small circle, the six center pieces of the magnets lie close together. They mayeven touch one another as their magnetization is equally distributed. At the circumference on the other hand, that is in the large circle, are twelve alternate from one another by large spaces. The mag nets are connected to the axis by a cast portion a (Fig. 1) which, after the arrangement of the parts, is cast in a mold. For this purpose the steel magnets mare placed in an iron cylinder in the manner shown in Figs. 4 and 5 and are held by distance pieces 9 in accurate divisions of the circumference by means of the magnetism present. These g are provided with small pins it which limit the insertion of the distance pieces through slots provided in the cylinder 7". The ends of the cylinder 7 are closed by metal plates 2'- and 7 a. These metal plates 2' and is are required for the rotating body and hold it together by means of the poles separated magnets being of such a spiral certain annular enlargements provided on their cir cumferences, should the cast portions break. When the magnets m have been connected to the plates 2' and 7c and the axis d, in the manner described, then the cast portion, for example, Portland cement, is cast through the openings Z in the plate 2'. After the setting of the cast portion the distance pieces 9 are removed and the rotary body A is taken out of the molding cylinder f.

This magnet system has the advantage over similar arrangements in that its production is simple and cheap. Besides this the separate magnets, in consequence of the available space, can be made proportionately long which is of great value in the production of powerful field magnets.

What I claim as my invention and desire to secure by Letters Patent is 2- 1. A rotary field magnet comprising a shaft, said magnets being of such a spiral shape that their opposite poles are arranged with a certain interval of space between them, parallel to the shaft, while the center parts of the magnets are inclined in relation to the shaft, means for securing the magnets to the shaft, and a stationary armature around the magnets.

2. A rotary field magnet comprising a shaft, a number of permanent magnets, said magnets being of such a spiral shape that their opposite poles are arranged with a certain interval of space between them, parallel to the shaft, while the center parts of the magnets are inclined in relation to theshaft, a cast portion forsecuring the magnets to the shaft and a stationary armature around said magnets substantially as described.

3. A rotary field magnet comprising a shaft, anumber of permanent magnets, said magnets being of such a spiral shape that their opposite poles are arranged with a certain interval of space between them, parallel to the shaft, while the center parts of the magnets are inclined in relation to the shaft, means for securing the magnets to the shaft, and plates provided at the ends of the -magnets, and a stationary armature around the magnets.

4. A rotary field magnet comprising a shaft, a number of permanent magnets, said shape that their opposite poles are arranged with a interval of space between them, parallel to the shaft, while the center part of the magnets are inclined in relation to the my name to this specification in the presence shaft, a l lzasthp(f trti( n(11 fiir securingdtahle malgof two subscribing witnesses. netstotesa an patesprovl atte ends of the magnets and a stationary arma- EMIL V B 5 ture around said magnets substantially as Witnesses:

described. I WOLDEMAR HAUPT, In witness whereof I have hereunto signed HENRY HASPER. 

